I'm trying to figure out how to make a cell that spans the full width of the existing column and sits on top of the nearest cell. This is part of an effort to create a percentage graph.
For example:
https://i.sstatic.net/XZahG.png
I've experimented with using absolute positioning in the tr or td elements, but no matter what I try, the width of the cell always ends up exceeding the width of the table.